Farmington is a town in Hartford county in Connecticut. It was formed in 1645 from the following town or towns: original. Farmington is a part of the Farmington probate district and has been since 1769. Hartford was/were the previous chronological district or districts. For more information, contact the county at 1 Monteith Dr. Farmington 06034-1053. On the attached map, Hartford is located at D3.